Portion of a snowboard boot sole



FIG. 1 is a top plan view plan view of a portion of a snowboard boot sole, showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a perspective view thereof.

The broken line showing of the remainder of the sole in FIGS. 1-5 is for illustrative purposes only and forms no part of claimed design. 

The ornamental design for a portion of a snowboard boot sole, as shown and described. 